CVE-2021-47167 NFS: Fix an Oopsable condition in __nfs_pageio_add_request()
A null pointer dereference in the Linux kernel NFS subsystem allows local attackers to cause a system crash via a specific page I/O operation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47167?
CVE-2021-47167 is a medium-severity vulnerability in Linux kernel, published on 25 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
NFS: Fix an Oopsable condition in __nfs_pageio_add_request()
Ensure that nfs_pageio_error_cleanup() resets the mirror array contents, so that the structure reflects the fact that it is now empty. Also change the test in nfs_pageio_do_add_request() to be more robust by checking whether or not the list is empty rather than relying on the value of pg_count.
Which versions are affected by CVE-2021-47167?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47167?
Apply the vendor's patch.
Is CVE-2021-47167 being exploited?
There is no known exploitation of CVE-2021-47167 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47167, GHSA-p224-3949-7fhp, UBUNTU-CVE-2021-47167.